Archaeologists now find strong links between early American stone tools and those from ancient Northeast Asia. These tools date back before 13,500 years ago, showing a shared way of making blades and bifacial tools. The tools were made using two main methods: shaping cores to strike long blades and carefully flaking tools from both sides. This combination created small, sharp points and scrapers. Researchers call this an 'American Upper Palaeolithic' tradition, a term usually used for Europe but now helpful worldwide. Similar methods appear in Northeast Asia, including northern Japan, from about 20,000 years ago. Some tool designs look nearly identical, suggesting the first Americans came from populations already skilled in these techniques. Genetic studies say the ancestors of Americans formed in northeast Asia around 25,000 years ago and moved into the Americas after 20,000 years ago. They might have traveled along the Pacific coast through connected land and islands in regions like Paleo Sakhalin-Hokkaido-Kuril, areas rich in marine resources. The traditional idea of a land bridge through Beringia has problems. Few sites are found there from the ice age, and harsh glacial conditions make long stays unlikely. Coastal routes leave fewer traces because of sea level rises, but they fit the evidence better. Several pre-Clovis sites across North America date from about 18,000 to 13,500 years ago. Their spread suggests people arrived even earlier and adapted their stone tool skills across a wide area. While questions remain about exact routes and dates, the new picture shows early Americans were more connected to ancient Asian cultures than once thought. Their arrival likely involved gradual movement along coasts, carrying with them advanced tool-making traditions.